Casing head



March 13, 1928.

C. C. HOSMER cAsINe HEAD Original Filed Sept. 15. 1922 028 flx 'PatentedMar. 13, 192s.

PATENT OFFICE.

CHESTER C. HOSMER, F HUNTINGTON BEACH, CALIFORNIA.

casina HEAD.

Original application led September 15, 1922, Serial No. 588,391. Dividedand this application led November 6, 1924.

This invention relates to a deep well ap- 'paratus and more particularlyto vcasing heads and it is an object of the present invention to providean extremely simple, substantial and practicable device for quickly andeffectively packing casing heads.

It is another object to provide a unitary packing device for casingheads and to provide a device that may be applied with or without theusual spider and that can be set in tight position by utilizing theweight of pipe to press down on the packing rings.

It is another object of this invention to provide a packer for a casinghead, in which the packer may be compressed by the weight of thecasingor by means independently of the weight of the casing, or by bothjointly,

' as may be desired.

The present application is a division of applicants application for apacker, Serial No.'

588,391, filed September 15, 1922, matured into U. S. PatentNumber1,525,58 2, in which the packer is claimed, the present inventionhaving the claims limited to the casing head structure.

My invention consists in the arrangement and construction of partshereinafter de'- scribed and claimed. f

In the accompanying drawin s, which form a part of the speci cation, Iave illustrated a casing head embodying my invention, and in whichFigure 1 is a central, longitudinal section through a suitable form ofcasing head show-v ing the packing applied and compressed by theclamping spider.

Fig. 2 is a central longitudinal section of the casing head showing theunitary packer compressed by the Weight of the casing alone, the collarsof the casing head resting directly upon the unitary packer.

Fig. 3 is a central longitudinal section through the unitary packer, and

Fig. 4 is a cross section through the casing, showing the manner ofapplying the unitary packer.

The invention is shown'as applied to a well casing 2 which extends upthrough an outer casing 3. A seal is made between the upper end of theouter casing 3 andthe inner casing 2 to revent the escape of gas fromthe outer casing and this seal is' formedby a fitting commonly called acasing head and which consists of a sleeve 5 having its lower serial No.748,105.

end threaded at 6 on the casing 3 and being provided with gas outlet tapholes 7 to receive gas pipe. The well head 5 is provided with aninwardly extending body forming a seat -8 and to form a tight joint withthe caspassed around the casing 2 and then closed as is shown in Figure1.

The deformable gasket 10 is adapted to be d compressed between metallicwear taking parts consisting of an upper two-piece collarl 11 and alower two-piece wedge 12, the lower end of which 'is tapered to conformto the tapering seat 8 in the casing head.

lVhen .it is desired to shut off the ,gas the unitary packer is slippedaround the casing,

2 and is then pushed 'down the casing so that it will enter the chamberwithin the upper end of the casing head 5. The packer is pushed astightly as may be possible and may be positively rammed to nal positionb the application of ordinary forms of too s or spiders, or it can berammed by the Weight of the inner casin 2.

lVhen the paciing device has been inserted in the casing head 5 aclamping spider 15 is shifted down the casing 2 and threaded on theupper end of the sleeve 5. The clamping spider 15 may be. utilized torun down on the upper collar 11 of thel packer and thereby compress thegasket 10 until it snugly einbraces the inner casing 2.

vThe clamping spider 15 consists of a fiat top portion 151 provided witha tapered Y,or

inverted conical seat 152 for the reception of slips 16, which may beinserted between casing 2 and clamping spider 15, if desired, to supportthe casing 2 on said clamping spider 15. An internally threaded flange153 extends downwardly from the flat top portion 151 forengagement withthe threaded upper portion of the sleeve 5. 15* designates an annularshoulder formed on the underside of the top portion 151 and the threadedflange 153. y

In the assembly shown in Fig. 1 it should be noted that the packer iscompressed by the clamping spider 15 whichA has [beenr los] screweddownupon the sleeve `5 until 4its annular shoulder 154 presses upon thetwo piece collar l1, causing the rubber gasket 10 to hug snu ly thecasing 2 and forming a tight joint t erewith.

In this assembly, it should be noted, the packer is not compressed bythe weight of the casing 2 but by the screwing of the clamping spider l5upon ythe sleeve 5. However, if desired, the weight of the casing may beused for compressing the packer by partly unscrewing the clamping spider15 .until its shoulder 15* is free of the split ring 11 of the acker, asclearly shown in Fig. 2. It should he noted that the shoulder 154 of theclamping spider l5 is adapted to engage the outer circular margin onl ofthe split ring 11 and that there is a su cient clearance for thecoupling 21 of the interior casing 2 to pass freely through the taperedseat 152 of the clamping spider and that saideoupling 21 rests upon theinner circularmargin of the split ring 11.

In some cases it is desirable to suspend the casing 2 by the clampingspider and the slips therein and this is accom lished by introducing anumber of wedge s aped slips 16 into the taperedseat 152 of the spider15; the inner concave faces of the slips 16 vbeing toothed or roughenedso as to grip the casing and hold the same.

The casing 2, after the removal of the slips 16 from the clamping spider15, may rest by its coupling 21 directly upon the split ring 11 of thepacker, as shown in Fig. 2. It should be noted that in such a case thecompression of the packer may be increased as desired, by screwin theclamping spider 15, which is now entire y unconnected of the casing 2,(see Fi 2),- down upon the split rinoy 11 of the pac er so that both theweight o the casing 2 and the pressure exerted by the clamping spiderupon the packer will compress the same. Furthermore, where the casing 2rests directly by its coupling 2l upon the packer, the clamping spider15 may be backed off the packer, leavin the packing compressed by theweight o the casing 2 alone.

Further embodiments, modifications and variations may be resorted towithin the spirit of the invention as here claimed.`

Iclaim: 1

1. A casing head comprising a sleeve applied toan exterior casing, saidsleeve havin an interior seat, a packer ositioned in sai sleeve andresting on sai seat to embrace an interior casingya clamping spiderconnected to said sleeve and adapted on its downward movement tocompress said packer, to seal the joint between the casing head and theinterior casing, said clamping spider having an aperture of sufficientsize for a coupling of the interior casing to rest directly upon saidacker without touching said clamping spi er, whereby the packer may becompressed by either the clamping spider, the weight of the interiorcasing, or both, as desired.

2. A casing head comprising a sleeve applied to an exterior casing, saidsleeve having an interior seat, a packer positioned in sald sleeve andresting on said seat to embrace an interior casing, a clamping spiderconnected to said sleeve and adapted on its downward movement tocompress said packer, said clamping s ider having an aperturc ofsufficient size or a coupling of the interior casing to rest directlyupon said packer without touching said clamping spider, the aperture ofsaid clamping spider being tapered for the reception of slips for thesupport of the weight of the interior, casing, whereby the packer may becompressed by either the clamping spider, the weight of' the interiorcasing, or both, as desired.

3. A casing head comprising a sleeve applied to an exterior casing, saidsleeve having an interior seat, a packer embracing an interior casingand resting on said seat, a clamping spider connected to said sleeve andhaving means adapted ou vits downward movement to compress the upperouter niargin only of said packer, said clamping spider having anaperture ot' suflicient size for a coupling of the interior casing topass freely therethrough and to rest directly upon said packer withouttouching said clamping spider, whereby the packer may be com pressed byeither the clamping spider, the weight of the interior casing, or both,as desired. l

4. A casing head comprising a seat for a packer, a packer on said seatand embracing an interior casing, a clamping spider connected to anexterior casing and adapted on its downward movement to compress saidpacker, said clamping spider having an aperture of suiiicient size for acoupling of the interior casing to pass freely therethrough and to restdirectly upon said packer without touching said clamping spider, wherebythe packer may be compressed by either the clamping spider, the weightof the interior casing, or both, as desired.

5. A casing head comprisin a sleeve applied to an exterior casing, saisleeve having an interior seat, a packer on said seat to embrace aninterior casing, a clamping spider having a central aperture andprovided with a shoulder'adjacentthe lower end of the aperture, saidshoulderrbeing'. adapted to compress on the downward movement of theclamping spider the upper outer circular margin only of said packer,said aperture being of sufficient size to permit a coupling of theinterior casing to pass freely therethrough and to rest directly uponsaid packer without `touching said clamping spider, whereby the packermay be compressed by eitherl the clamping spider, the

weight of the interior casing, or both, as

desired.

6. A casing head comprising a sleeve screw threaded on 4an exteriorcasing, the said sleeve having an interior seat, a packer on said seatto embrace an interior casing, a clamping spider screw threaded to saidsleeve and being` provided intermediate its upper and lower ends with aninternal shoulder adapted on the downward movement of said clampingspider to-compress said packer, said clamping spider being provided witha central aperture of sufficient size to permit a coupling of saidinterior casing to pass freely therethrough and to rest directly uponsaid packer without touch.

ing said clamping spider, whereby the packer may be compressed b eitherthe clamping spider, the weight o the interior casing, or both, asdesired.

7. A casing head comprising a sleeve removably attached to an exteriorcasing, said sleeve having an interior seat, a packer on said seat toembrace an interior casing, a

clamping spider screw threaded on the exterior upper end of said sleeveand having acentral tapered aperturel adapted for the reception of slipsfor the support of the said interior casing, said aperture being ofsufficient size to permit the couplin of the interior casing to passfreely theret irough and to rest directly on the said packer withouttouching said clamping spider, said clamping spider having an interiorcircular shoulder intermediate its upper and lower ends adapted on thedownward movement of said clamping spiderfto engage the upper outermargin of said packer and to compress the same, whereby the packer maybe com )ressed by either the clamping spider, the weight of the interiorcasing, or both, as desired.

8. A casing head comprising a seat for a packer, a packer on saidseatand embracconnected-to the casing head, said spider having anaperture of sutlicient size for a coupling of the interior casing topass freely therethrough and to rest directly upon said packing withouttouching said spider, and clamping means associated with the spideradapted to compress the packer, whereby the packer may be compressedeither by the weight of the casing alone, or by the' clamping meansassociated with said spider, vor both, as desired. Y

Intestimony whereof I have signed my name to this specification.

CHESTER C. HOSMER.

lng an interior casing, a removable spider

